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故障现象:一辆钱江QJ100型摩托车(林海—雅马哈二冲程发动机),已行驶4000 km挂四档行驶时掉档。 故障诊断:怀疑主轴二档花键齿轮的端面拨爪磨损成锥形,导致主轴二档齿轮端面拨爪插入主轴四档齿轮端面爪孔中,挂四档时产生轴向力所致。但根据该车行驶的总路程(4000 km)判断,觉得又不可能。拆开发动机检查,发现档位和齿轮均正常。又怀疑是变速鼓上的拨叉变形所致,换上新变速鼓和拨叉装机试车,故障仍不能排除。后又拆开发动机检查,发现变速箱主轴滚针轴承一端的衬套外移了,导致主轴向衬套一端轴
Symptoms: a Qianjiang QJ100 motorcycle (Linhai - Yamaha two-stroke engine), has been driving 4000 km linked to fourth gear when leaving the file. Fault diagnosis: Suspect spindle spline gears on the face of the claw wear tapered, resulting in the spindle gear second gear into the face of the fourth gear gear claw hole, the fourth gear when the resulting axial force. However, according to the total distance traveled by the car (4000 km) to determine, I feel impossible. Open the engine check and found the gear and gear are normal. Suspected to be caused by the distortion of the fork on the speed change drum, put on a new speed change drum and fork mounted test machine, the fault can not be ruled out. Then open the engine check and found that the gearbox spindle needle bearing on one end of the sleeve moved out, leading to the spindle to the bushing on one end of the shaft